{"id":24269,"date":"2017-06-02T17:32:13","date_gmt":"2017-06-02T08:32:13","guid":{"rendered":"http:\/\/www.sejuku.net\/blog\/?p=24269"},"modified":"2024-05-06T11:42:53","modified_gmt":"2024-05-06T02:42:53","slug":"%e5%9f%ba%e6%9c%ac%e3%83%af%e3%82%b6%ef%bc%81javascipt%e3%81%aeparseint%e3%81%ae10%e3%81%ae%e3%83%86%e3%82%af%e3%83%8b%e3%83%83%e3%82%af","status":"publish","type":"post","link":"https:\/\/www.sejuku.net\/blog\/24269","title":{"rendered":"\u3010JavaScript\u5165\u9580\u3011\u6587\u5b57\u5217\u3092\u6570\u5024\u306b\u5909\u63db\u3059\u308b\u65b9\u6cd5\uff5cparseInt\u3001 parseFloat"},"content":{"rendered":"<p>JavaScript\u3092\u4f7f\u3063\u3066\u3044\u308b\u3068\u3001\u6587\u5b57\u5217\u3092\u6574\u6570\u3084\u5c0f\u6570\u70b9\u306b\u5909\u63db\u3059\u308b\u5fc5\u8981\u6027\u304c\u3067\u3066\u304f\u308b\u3053\u3068\u3082\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u4eca\u56de\u306f\u3001JavaScript\u3067\u6570\u5024\u5909\u63db\u3092\u3057\u305f\u3044\u5834\u5408\u306b\u3088\u304f\u4f7f\u3046\u300cparseInt\u300d\u3084\u3001\u5c0f\u6570\u70b9\u3092\u6271\u3046\u969b\u306b\u4fbf\u5229\u306a\u300cparseFloat\u300d\u306b\u3064\u3044\u3066\u5b66\u7fd2\u3092\u3057\u307e\u3057\u3087\u3046\uff01<br \/>\n<div class=\"box01\"><\/p>\n<ul>\n<li><b>\u3010\u57fa\u790e\u3011parseInt()\u3068\u306f\uff1f<\/b><\/li>\n<li><b>\u3010\u57fa\u790e\u3011parseInt()\u306e\u4f7f\u3044\u65b9<\/b><\/li>\n<li><b>\u3010\u57fa\u790e\u3011parseInt()\u306e\u6d3b\u7528<\/b><\/li>\n<li><b>\u3010\u767a\u5c55\u3011parseInt()\u306e\u30a8\u30e9\u30fc\u30cf\u30f3\u30c9\u30ea\u30f3\u30b0\u306b\u3064\u3044\u3066<\/b><\/li>\n<li><b>\u3010\u767a\u5c55\u3011parseFloat()\u3067\u5c0f\u6570\u70b9\u306b\u5909\u63db\u3059\u308b\u65b9\u6cd5<\/b><\/li>\n<\/ul>\n<\/div>\n<p>\u306a\u3069\u306e\u57fa\u672c\u304b\u3089\u5fdc\u7528\u7684\u306a\u6d3b\u7528\u6280\u306b\u3064\u3044\u3066\u3082\u3057\u3063\u304b\u308a\u3068\u89e3\u8aac\u3092\u3057\u3066\u3044\u304d\u307e\u3059\uff01\u3053\u306e\u8a18\u4e8b\u3067\u3001\u300cparseInt\u300d\u300cparseFloat\u300d\u306e\u4f7f\u3044\u65b9\u3092\u3057\u3063\u304b\u308a\u3068\u30de\u30b9\u30bf\u30fc\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u3087\u3046\uff01<\/p>\n<h2>parseInt()\u3068\u306f<\/h2>\n<p>\u305d\u308c\u3067\u306f\u3001\u307e\u305a\u6700\u521d\u306b\u57fa\u672c\u7684\u306a\u77e5\u8b58\u304b\u3089\u5b66\u7fd2\u3092\u9032\u3081\u3066\u3044\u304d\u307e\u3057\u3087\u3046\uff01JavaScript\u306b\u9650\u3089\u305a\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u306b\u304a\u3044\u3066\u6271\u3046\u306e\u306f\u300c\u6570\u5024\u300d\u3060\u3051\u3067\u306a\u304f\u300c\u6587\u5b57\u5217\u300d\u3082\u5b58\u5728\u3057\u3066\u3044\u307e\u3059\u3088\u306d\uff1f<\/p>\n<p>\u4f55\u3089\u304b\u306e\u6570\u5024\u8a08\u7b97\u3092\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u3059\u308b\u6642\u306b\u3001\u6570\u5024\u306e\u300c123\u300d\u3068\u6587\u5b57\u5217\u306e\u300c123\u300d\u3092<b>\u540c\u3058\u3088\u3046\u306b\u6271\u3044\u305f\u3044\u3088\u3046\u306a\u30b1\u30fc\u30b9\u3067\u300cparseInt\u300d\u306f\u975e\u5e38\u306b\u5f79\u306b\u7acb\u3064<\/b>\u306e\u3067\u3059\u3002<\/p>\n<p>\u3064\u307e\u308a\u3001\u6587\u5b57\u5217\u300c123\u300d\u306e\u307e\u307e\u3067\u306f\u8a08\u7b97\u304c\u3067\u304d\u307e\u305b\u3093\u304c\u3001parseInt\u3067\u6570\u5024\u306b\u5909\u63db\u3057\u3066\u3057\u307e\u3048\u3070\u7c21\u5358\u306b\u8a08\u7b97\u304c\u3067\u304d\u308b\u3068\u3044\u3046\u306e\u304c\u4eca\u56de\u306e\u30c6\u30fc\u30de\u306b\u306a\u308a\u307e\u3059\uff01<\/p>\n<h2>parseInt()\u306e\u4f7f\u3044\u65b9<\/h2>\n<p>\u3053\u3053\u304b\u3089\u306f\u3001\u5b9f\u969b\u306bparseInt()\u3092\u4f7f\u3063\u305f\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u624b\u6cd5\u3092\u5b66\u3093\u3067\u3044\u304d\u307e\u3057\u3087\u3046\u3002parseInt()\u306e\u57fa\u672c\u7684\u306a\u8a18\u8ff0\u65b9\u6cd5\u3084\u5f15\u6570\u306b\u57fa\u6570\u3092\u5229\u7528\u3059\u308b\u65b9\u6cd5\u300110\u9032\u6570\u4ee5\u5916\u306e\u6271\u3044\u65b9\u307e\u3067\u8a73\u3057\u304f\u89e3\u8aac\u3059\u308b\u306e\u3067\u53c2\u8003\u306b\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<h3>parseInt()\u3067\u6587\u5b57\u5217\u3092\u6570\u5024\u306b\u5909\u63db\u3059\u308b\u65b9\u6cd5<\/h3>\n<p>\u305d\u308c\u3067\u306f\u3001\u57fa\u672c\u7684\u306aparseInt()\u3092\u4f7f\u3063\u305f\u6570\u5024\u5909\u63db\u3092\u8a66\u3057\u3066\u307f\u307e\u3057\u3087\u3046\uff01<\/p>\n<p>\u300cparserInt\u300d\u306f\u6587\u5b57\u5217\u578b\u306e\u5024\u3092\u89e3\u6790\uff08\u30d1\u30fc\u30b9\uff09\u3057\u3066<b>Number\u578b\u306e\u6570\u5024\u306b\u5909\u63db\u3057\u3066\u304f\u308c\u308b\u6a5f\u80fd<\/b>\u3092\u6301\u3063\u3066\u3044\u307e\u3059\u3002\u4e00\u822c\u7684\u306a\u8a18\u8ff0\u65b9\u6cd5\u3068\u3057\u3066\u306f\u3001\u3010 parseInt( \u6587\u5b57\u5217 ) \u3011\u306e\u3088\u3046\u306b\u5f15\u6570\u3078\u6570\u5024\u306b\u5909\u63db\u3057\u305f\u3044\u6587\u5b57\u5217\u3092\u6307\u5b9a\u3059\u308b\u3060\u3051\u3067\u3059\u3002<\/p>\n<p>\u6b21\u306e\u30b5\u30f3\u30d7\u30eb\u4f8b\u3092\u898b\u3066\u304f\u3060\u3055\u3044\uff01<\/p>\n<pre class=\"lang:js decode:true \">var str = '123';\r\nvar result = parseInt( str );\r\n\r\nconsole.log( 'str\uff1a' + typeof str );\r\nconsole.log( 'result\uff1a' + typeof result );<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c<\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \">str\uff1astring\r\nresult\uff1anumber<\/pre>\n<p>\u3053\u306e\u4f8b\u3067\u306f\u3001\u6587\u5b57\u5217\u300c123\u300d\u3092\u5909\u6570str\u306b\u4ee3\u5165\u3057\u3066parseInt()\u3092\u5b9f\u884c\u3057\u3066\u3044\u307e\u3059\u3002\u300ctypeof\u300d\u3092\u4f7f\u3063\u3066\u5909\u6570\u300cstr\u300d\u300cresult\u300d\u306e\u578b\u3092\u30c1\u30a7\u30c3\u30af\u3057\u3066\u3044\u308b\u306e\u304c\u5206\u304b\u308b\u3067\u3057\u3087\u3046\u304b\uff1f\u5b9f\u884c\u7d50\u679c\u3092\u898b\u308b\u3068\u3001\u6587\u5b57\u5217\u3092\u4ee3\u5165\u3057\u3066\u3044\u305f\u5909\u6570\u300cstr\u300d\u306e\u578b\u306f\u300c\u6587\u5b57\u5217\u578b\uff08string\uff09\u300d\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u305d\u3057\u3066\u3001\u3053\u306e\u6587\u5b57\u5217\u306b\u5bfe\u3057\u3066parseInt()\u3092\u5b9f\u884c\u3057\u305f\u5909\u6570\u300cresult\u300d\u306e\u578b\u306f\u300c\u6570\u5024\u578b\uff08number\uff09\u300d\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u306d\uff01\u3053\u306e\u3088\u3046\u306b\u3001parseInt()\u3092\u4f7f\u3046\u3068\u7c21\u5358\u306b\u6587\u5b57\u5217\u3092\u6570\u5024\u578b\u3068\u3057\u3066\u6271\u3048\u308b\u3088\u3046\u306b\u306a\u308b\u306e\u3067\u4fbf\u5229\u3067\u3059\u3002<\/p>\n<h3>\u300c\u57fa\u6570\u300d\u3092\u4f7f\u3063\u305f\u6570\u5024\u5909\u63db\u306e\u65b9\u6cd5\u306b\u3064\u3044\u3066<\/h3>\n<p>parseInt()\u306e\u7b2c\uff12\u5f15\u6570\u306b\u300c\u57fa\u6570\u300d\u3092\u6307\u5b9a\u3059\u308b\u3068\u3001\u6587\u5b57\u5217\u306f\u305d\u306e\u57fa\u6570\u3092\u30d9\u30fc\u30b9\u306b\u6570\u5024\u5909\u63db\u3055\u308c\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002\u3064\u307e\u308a\u3001\u57fa\u6570\u3092\u300c10\u300d\u3068\u3059\u308c\u307010\u9032\u6570\u306b\u306a\u308a\u3001\u57fa\u6570\u3092\u300c16\u300d\u3068\u3059\u308c\u307016\u9032\u6570\u3067\u5909\u63db\u3055\u308c\u308b\u3068\u3044\u3046\u308f\u3051\u3067\u3059\u3002<\/p>\n<p>\u8a66\u3057\u306b\u3001\u5b9f\u969b\u306e\u30b3\u30fc\u30c9\u3067\u78ba\u8a8d\u3057\u3066\u307f\u307e\u3057\u3087\u3046\uff01<\/p>\n<pre class=\"lang:js decode:true\">console.log( 'parseInt(\"123\", 10) = ' + parseInt(\"123\", 10) );\r\n\r\nconsole.log( 'parseInt(\"3F\", 16) = ' + parseInt(\"3F\", 16) );<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c<\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \">parseInt(\"123\", 10) = 123\r\nparseInt(\"3F\", 16) = 63<\/pre>\n<p>\u307e\u305a1\u3064\u76ee\u306e\u4f8b\u3067\u306f\u3001\u6587\u5b57\u5217\u300c123\u300d\u306bparseInt()\u3092\u5b9f\u884c\u3059\u308b\u3053\u3068\u306710\u9032\u6570\u306e\u300c123\u300d\u3092\u53d6\u5f97\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u306f\u4eca\u307e\u3067\u901a\u308a\u306e\u7d50\u679c\u306a\u306e\u3067\u3059\u304c\u3001\u7b2c2\u5f15\u6570\u3092\u7701\u7565\u3059\u308b\u3068\u30c7\u30d5\u30a9\u30eb\u30c8\u306710\u9032\u6570\u304c\u9069\u7528\u3055\u308c\u308b\u4ed5\u7d44\u307f\u306b\u306a\u3063\u3066\u3044\u308b\u304b\u3089\u306a\u306e\u3067\u3059\u3002<\/p>\n<p>\u307e\u305f\u30012\u3064\u76ee\u306e\u4f8b\u3067\u306f\u6587\u5b57\u5217\u300c3F\u300d\u304c\u8a2d\u5b9a\u3055\u308c\u3066\u3044\u307e\u3059\u304c\u3001\u57fa\u6570\u3092\u300c16\u300d\u3068\u6307\u5b9a\u3057\u3066\u3044\u308b\u306e\u306716\u9032\u6570\u306e\u6271\u3044\u306b\u306a\u308b\u308f\u3051\u3067\u3059\u3002\u305d\u306e\u305f\u3081\u300116\u9032\u6570\u306e\u300c3F\u300d\u3068\u89e3\u91c8\u3055\u308c\u3066\u300c63\u300d\u3068\u3044\u3046Number\u578b\u306e\u6570\u5024\uff0810\u9032\u6570\uff09\u306b\u5909\u63db\u3055\u308c\u308b\u306e\u3067\u3059\u3002<\/p>\n<h3>parseInt()\u30672\u9032\u30fb8\u9032\u30fb16\u9032\u306e\u5909\u63db\u30b3\u30fc\u30c9\u4f8b(example)<\/h3>\n<p>\u3055\u3066\u3001parseInt()\u3067\u57fa\u6570\u306e\u4f7f\u3044\u65b9\u3092\u5b66\u3093\u3060\u3068\u3053\u308d\u3067\u3001\u3055\u307e\u3056\u307e\u306a\u57fa\u6570\u306e\u6570\u5024\u5909\u63db\u306b\u3082\u6311\u6226\u3057\u3066\u307f\u307e\u3057\u3087\u3046\uff0110\u9032\u6570\u4ee5\u5916\u306b2\u9032\u6570\u30fb8\u9032\u6570\u30fb16\u9032\u6570\u306a\u3069\u306e\u6587\u5b57\u5217\u3092\u4f7f\u3063\u3066\u3001\u305d\u308c\u305e\u308c\u306e\u5909\u63db\u51e6\u7406\u304c\u3069\u306e\u3088\u3046\u306b\u306a\u308b\u304b\u3092\u5b9f\u969b\u306b\u8a66\u3057\u3066\u307f\u307e\u3059\u3002<\/p>\n<p>\u6b21\u306e\u30b5\u30f3\u30d7\u30eb\u4f8b\u3092\u898b\u3066\u304f\u3060\u3055\u3044\uff01<\/p>\n<pre class=\"lang:js decode:true \">\/\/10\u9032\u6570\u306e\u5834\u5408\r\nconsole.log('10\u9032\u6570\u300c12px\u300d = ' + parseInt('12px', 10));\r\n\r\n\/\/2\u9032\u6570\u306e\u5834\u5408\r\nconsole.log('2\u9032\u6570\u300c101\u300d = ' + parseInt('101', 2));\r\n\r\n\/\/8\u9032\u6570\u306e\u5834\u5408\r\nconsole.log('8\u9032\u6570\u300c755\u300d = ' + parseInt('755', 8));\r\n\r\n\/\/16\u9032\u6570\u306e\u5834\u5408\r\nconsole.log('16\u9032\u6570\u300cAZZ\u300d = ' + parseInt('AZZ', 16));<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c<\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \">10\u9032\u6570\u300c12px\u300d = 12\r\n2\u9032\u6570\u300c101\u300d = 5\r\n8\u9032\u6570\u300c755\u300d = 493\r\n16\u9032\u6570\u300cAZZ\u300d = 10<\/pre>\n<p>\u307e\u305a\u6700\u521d\u306b\u300110\u9032\u6570\u306e\u300c12px\u300d\u306b\u6ce8\u76ee\u3057\u3066\u304f\u3060\u3055\u3044\uff01\u7d50\u679c\u7684\u306b\u6570\u5024\u306e12\u306b\u5909\u63db\u3055\u308c\u3066\u3044\u307e\u3059\u304c\u3001\u3053\u308c\u306f\u300cpx\u300d\u304c\u6570\u5024\u3067\u306f\u306a\u3044\u306e\u3067\u305d\u306e\u6642\u70b9\u3067\u5909\u63db\u51e6\u7406\u304c\u4e2d\u65ad\u3057\u3066\u3044\u308b\u305f\u3081\u3067\u3059\u3002<\/p>\n<p>\u3053\u306e\u3088\u3046\u306b\u3001parseInt\u306f\u6570\u5024\u3067\u306a\u3044\u6587\u5b57\u5217\u304c\u73fe\u308c\u308b\u524d\u307e\u3067\u306e<b>\u6570\u5024\u3092Number\u578b\u306b\u5909\u63db\u3059\u308b\u6a5f\u80fd\u3092\u6301\u3063\u3066\u3044\u308b<\/b>\u306e\u3067\u3059\u3002\u305d\u306e\u4ed6\u306e2\u9032\u6570\u30fb8\u9032\u6570\u30fb16\u9032\u6570\u3082\u305d\u308c\u305e\u308c\u6570\u5024\u5909\u63db\u3067\u304d\u3066\u3044\u308b\u3053\u3068\u304c\u5206\u304b\u308a\u307e\u3059\u306d\u3002<\/p>\n<p>\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306e\u4e16\u754c\u3067\u306f\u3055\u307e\u3056\u307e\u306a\u57fa\u6570\u3092\u6271\u3046\u3053\u3068\u304c\u591a\u3044\u306e\u3067\u3001\u305f\u3068\u304810\u9032\u6570\u3092\u6271\u3046\u5834\u5408\u3067\u3082\u57fa\u6570\u306f\u660e\u793a\u7684\u306b\u6307\u5b9a\u3059\u308b\u3068\u826f\u3044\u3067\u3057\u3087\u3046\uff01<\/p>\n<h2>parseInt()\u306e\u6d3b\u7528<\/h2>\n<p>\u3053\u3053\u304b\u3089\u306f\u3001parseInt()\u3092\u3055\u3089\u306b\u6d3b\u7528\u3059\u308b\u65b9\u6cd5\u306b\u3064\u3044\u3066\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002\u4e3b\u306b\u3001\u30ab\u30f3\u30de\u533a\u5207\u308a\u306e\u6271\u3044\u3001\u6700\u5927\u5024\u306b\u3064\u3044\u3066\u3001\u5c11\u6570\u306e\u4e38\u3081\u65b9\u306b\u3064\u3044\u3066\u5b66\u3093\u3067\u3044\u304d\u307e\u3059\u3002<\/p>\n<h3>parseInt()\u3067\u30ab\u30f3\u30de\u533a\u5207\u308a\u306e\u6271\u3044\u65b9(replace)<\/h3>\n<p>\u3053\u308c\u307e\u3067\u5b66\u3093\u3067\u304d\u305f\u3088\u3046\u306b\u3001parseInt\u306f\u6570\u5024\u3067\u306a\u3044\u300c\u5024\u300d\u306f\u8a8d\u8b58\u3057\u306a\u3044\u308f\u3051\u3067\u3059\u304c\u3001\u3082\u3057\u300c\u30ab\u30f3\u30de\u533a\u5207\u308a\u300d\u306e\u6570\u5024\u3092\u5909\u63db\u3057\u305f\u3044\u5834\u5408\u306b\u306f\u3069\u3046\u3059\u308c\u3070\u826f\u3044\u3067\u3057\u3087\u3046\u304b\uff1f<\/p>\n<p>\u3053\u306e\u3088\u3046\u306a\u5834\u5408\u306b\u306f\u3001<b>parseInt\u3092\u5b9f\u884c\u3059\u308b\u524d\u306b\u30ab\u30f3\u30de\u3092\u53d6\u308a\u9664\u304f\u51e6\u7406<\/b>\u3092\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u3057\u306a\u304f\u3066\u306f\u3044\u3051\u307e\u305b\u3093\u3002\u4f8b\u3048\u3070\u3001\u4ee5\u4e0b\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u306f\u300creplace()\u30e1\u30bd\u30c3\u30c9\u300d\u306e\u6b63\u898f\u8868\u73fe\u306b\u300c\/,\/g\u300d\u3092\u4e0e\u3048\u3066\u3001\u5408\u81f4\u3059\u308b\u30ab\u30f3\u30de\u3092\u300c\u7a7a\u6587\u5b57\u300d\u306b\u7f6e\u63db\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<pre class=\"lang:js decode:true \">function removeComma(value) {\r\n    var num = value.replace(\/,\/g, \"\");\r\n    \r\n    return parseInt(num);\r\n}\r\n\r\nvar result = removeComma( '123,456,789' );\r\n\r\nconsole.log( \"123,456,789 \u2192 \" + result );<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c<\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \">123,456,789 \u2192 123456789<\/pre>\n<p>\u3053\u306e\u4f8b\u3067\u306f\u3001\u5bfe\u8c61\u3068\u306a\u308b\u6587\u5b57\u5217\u306b\u300creplace()\u300d\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3063\u3066<b>\u300c, (\u30ab\u30f3\u30de)\u300d\u3060\u3051\u3092\u7a7a\u6587\u5b57\u306b\u7f6e\u63db\u3057\u3066\u3044\u308b<\/b>\u306e\u304c\u5206\u304b\u308a\u307e\u3059\u3002\u305d\u306e\u7f6e\u63db\u3055\u308c\u305f\u6587\u5b57\u5217\u306f\u3001parseInt\u3067\u6570\u5024\u5909\u63db\u3057\u3066\u8fd4\u3059\u3088\u3046\u306breturn\u3059\u308b\u3053\u3068\u3067\u30ab\u30f3\u30de\u533a\u5207\u308a\u3092\u6392\u9664\u3057\u305f\u6570\u5024\u3068\u3057\u3066\u5b9f\u884c\u7d50\u679c\u306b\u51fa\u529b\u3055\u308c\u3066\u3044\u307e\u3059\u306d\u3002<\/p>\n<p>\u3053\u306e\u3088\u3046\u306b\u3001\u30ab\u30f3\u30de\u533a\u5207\u308a\u3084\u5c0f\u6570\u70b9\u306e\u3088\u3046\u306a\u7279\u6b8a\u306a\u5024\u3092\u5909\u63db\u3059\u308b\u30b5\u30f3\u30d7\u30eb\u4e8b\u4f8b\u306b\u3064\u3044\u3066\u306f\u3001\u6b21\u306e\u8a18\u4e8b\u3067\u3055\u3089\u306b\u8a73\u3057\u304f\u89e3\u8aac\u3057\u3066\u3044\u308b\u306e\u3067\u305c\u3072\u53c2\u8003\u306b\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\uff01<\/p>\n            <a href=\"https:\/\/www.sejuku.net\/blog\/23998\" class=\"blog-card-anchor\">\n                <div class=\"blog-card\">\n                <div class=\"blog-card-content\">\n                    <div class=\"blog-card-thumbnail\">\n                    <img decoding=\"async\" class=\"blog-card-thumbnail-img\" src=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2017\/08\/image-211-150x86.jpg\">\n                    <\/div>\n                    <div class=\"blog-card-title-wrap\">\n                    <div class=\"blog-card-title\">\u3010Javascript\u5165\u9580\u3011\u6570\u5024\u21d4\u6587\u5b57\u5217\u306e\u5909\u63db(toString\/Number\/parseInt)<\/div>\n                    <div class=\"blog-card-update-date\">\u66f4\u65b0\u65e5\uff1a2024\u5e745\u67086\u65e5<\/div>\n                    <\/div>\n                <\/div>\n                <\/div>\n            <\/a>\n            \n<h3>parseInt()\u3067\u6271\u3048\u308b\u6700\u5927\u5024\u3068\u306f\uff1f<\/h3>\n<p>\u4eca\u5ea6\u306f\u3001parseInt\u3067\u6570\u5024\u5909\u63db\u3067\u304d\u308b\u6700\u5927\u5024\u306b\u3064\u3044\u3066\u5b66\u7fd2\u3057\u3066\u307f\u307e\u3057\u3087\u3046\uff01JavaScript\u3067\u306f\u3001Number\u578b\u306e\u6574\u6570\u306e\u6700\u5927\u5024\u3092\u53d6\u5f97\u3067\u304d\u308b\u300cNumber.MAX_SAFE_INTEGER\u300d\u3068\u3044\u3046\u5b9a\u6570\u304c\u7528\u610f\u3055\u308c\u3066\u3044\u308b\u306e\u3067\u3053\u308c\u3092\u4f7f\u3063\u3066\u78ba\u304b\u3081\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\u307e\u305f\u300164\u30d3\u30c3\u30c8\u30b3\u30f3\u30d4\u30e5\u30fc\u30bf\u306e\u6570\u5024\u306e\u6700\u5927\u5024\u306f2\u306e64\u4e57\u3067\u3042\u308a\u3001\u3053\u308c\u306fMath.pow(2, 64)\u3067\u8a08\u7b97\u3067\u304d\u307e\u3059\u3002\u305d\u308c\u305e\u308c\u306e\u30b1\u30fc\u30b9\u3067\u3001parseInt\u3067\u304d\u308b\u304b\u3069\u3046\u304b\u3092\u78ba\u8a8d\u3057\u3066\u307f\u307e\u3057\u3087\u3046\uff01<\/p>\n<pre class=\"lang:js decode:true\">\/\/ \u2460Number\u578b\u306e\u6700\u5927\u6574\u6570\u5024\r\nvar maxNumber = String( Number.MAX_SAFE_INTEGER );\r\n\r\n\/\/ \u246164\u30d3\u30c3\u30c8PC\u306e\u6700\u5927\u5024\r\nvar bigNumber = String( Math.pow(2, 64) );\r\n\r\nconsole.log(\"parseInt(\" + bigNumber + \") = \" + parseInt(bigNumber));\r\nconsole.log(\"parseInt(\" + maxNumber + \") = \" + parseInt(maxNumber));<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c<\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \">parseInt(18446744073709552000) = 18446744073709552000\r\nparseInt(9007199254740991) = 9007199254740991<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c\u3092\u898b\u3066\u306e\u3068\u304a\u308a\u3001\u4e21\u65b9\u306e\u30b1\u30fc\u30b9\u306b\u304a\u3051\u308b\u6700\u5927\u5024\u306f\u3057\u3063\u304b\u308a\u3068parseInt\u304c\u5b9f\u884c\u3067\u304d\u3066\u3044\u308b\u306e\u304c\u5206\u304b\u308a\u307e\u3059\u306d\u3002\u5b9f\u969b\u306e\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u3067\u3053\u306e\u3088\u3046\u306a\u5927\u304d\u306a\u6570\u5024\u3092\u6271\u3046\u3053\u3068\u306f\u5c11\u306a\u3044\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u304c\u3001\u305c\u3072\u53c2\u8003\u306b\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\uff01<\/p>\n<h3>\u5c0f\u6570\u70b9\u306e\u4e38\u3081\u65b9(round)\u306e\u6ce8\u610f\u70b9<\/h3>\n<p>parseInt()\u3067\u5c0f\u6570\u70b9\u3092\u6271\u3046\u5834\u5408\u306b\u306f\u6ce8\u610f\u304c\u5fc5\u8981\u306a\u306e\u3067\u5408\u308f\u305b\u3066\u3054\u7d39\u4ecb\u3057\u3066\u304a\u304d\u307e\u3059\u3002\u307e\u305a\u306f\u3001parseInt()\u306e\u5f15\u6570\u306b\u5c0f\u6570\u70b9\u3092\u6307\u5b9a\u3059\u308b\u3068\u3069\u3046\u306a\u308b\u304b\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\uff01<\/p>\n<pre class=\"lang:js decode:true\">var result1 = parseInt('3.14');\r\nvar result2 = parseInt('3.89'));\r\n\r\nconsole.log(result1);\r\nconsole.log(result2);\r\n<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c<\/p>\n<pre class=\"theme:dark-terminal lang:default decode:true\">3\r\n3\r\n<\/pre>\n<p>\u3053\u306e\u4f8b\u3067\u306f\u6587\u5b57\u5217\u306e\u5c0f\u6570\u70b9\u3092\u6307\u5b9a\u3057\u3066\u3044\u307e\u3059\u304c\u3001\u6570\u5024\u3067\u3042\u3063\u3066\u3082\u5b9f\u884c\u7d50\u679c\u306f\u540c\u3058\u306b\u306a\u308a\u307e\u3059\u3002\u5b9f\u884c\u7d50\u679c\u3092\u3088\u304f\u898b\u308b\u3068\u3001\u3069\u3061\u3089\u3082\u300c3\u300d\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3088\u306d\uff1f<\/p>\n<p>\u6307\u5b9a\u3057\u305f\u5c0f\u6570\u70b9\u306f\u300c3.14\u300d\u3068\u300c3.89\u300d\u3067\u3059\u304c\u3001\u91cd\u8981\u306a\u306e\u306f<b>\u56db\u6368\u4e94\u5165\u3067\u6574\u6570\u306b\u306a\u3063\u3066\u3044\u306a\u3044\u3068\u3044\u3046\u70b9<\/b>\u3067\u3059\u3002\u5358\u7d14\u306b\u5c0f\u6570\u70b9\u4ee5\u4e0b\u3092\u5207\u308a\u6368\u3066\u3066\u3044\u308b\u3060\u3051\u306a\u306e\u3067\u3001\u6df7\u4e71\u3057\u306a\u3044\u3088\u3046\u306b\u899a\u3048\u3066\u304a\u304d\u307e\u3057\u3087\u3046\uff01<\/p>\n<h2>parseInt()\u306e\u30a8\u30e9\u30fc\u30cf\u30f3\u30c9\u30ea\u30f3\u30b0\u306b\u3064\u3044\u3066<\/h2>\n<p>\u3053\u3053\u304b\u3089\u306f\u3001parseInt()\u30e1\u30bd\u30c3\u30c9\u3067\u3088\u304f\u3042\u308b\u30a8\u30e9\u30fc\u306e\u5bfe\u51e6\u6cd5\u306b\u3064\u3044\u3066\u89e3\u8aac\u3092\u3057\u3066\u3044\u304d\u307e\u3059\uff01parseInt()\u3067\u60f3\u5b9a\u3055\u308c\u308b\u30a8\u30e9\u30fc\u3068\u3044\u3046\u306e\u306f\u3001<b>\u6271\u3046\u6587\u5b57\u5217\u304c\u6570\u5024\u3068\u3057\u3066\u8a8d\u8b58\u3067\u304d\u308b\u304b\u3069\u3046\u304b\uff1f<\/b>\u3068\u3044\u3046\u70b9\u304c\u91cd\u8981\u306a\u30dd\u30a4\u30f3\u30c8\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u305d\u3053\u3067\u3001\u3053\u306e\u3088\u3046\u306a\u8a8d\u8b58\u30a8\u30e9\u30fc\u306b\u5bfe\u51e6\u3067\u304d\u308b\u4fbf\u5229\u306a\u30e1\u30bd\u30c3\u30c9\u306e\u4f7f\u3044\u65b9\u3092\u5b66\u3093\u3067\u3044\u304d\u307e\u3057\u3087\u3046\uff01<\/p>\n<h3>\u6570\u5024\u3068\u8a8d\u8b58\u3055\u308c\u306a\u3044\u5834\u5408\u306f\u300cNaN\u300d\u306b\u306a\u308b<\/h3>\n<p>parseInt()\u306e\u5f15\u6570\u306b\u6587\u5b57\u5217\u3092\u8a2d\u5b9a\u3057\u305f\u6642\u306b\u3001\u6570\u5024\u3068\u3057\u3066\u8a8d\u8b58\u3067\u304d\u306a\u304b\u3063\u305f\u5834\u5408\u306f\u300cNaN\uff08Not a Number\uff09\u300d\u3078\u5909\u63db\u3055\u308c\u307e\u3059\u3002<\/p>\n<p>\u6b21\u306e\u30b5\u30f3\u30d7\u30eb\u4f8b\u3092\u898b\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<pre class=\"lang:js decode:true \">console.log( '10\u9032\u6570\u300cabc\u300d = ' + parseInt('abc', 10) ); \r\nconsole.log( '2\u9032\u6570\u300c789\u300d = ' + parseInt('789', 2) );<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c<\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \">10\u9032\u6570\u300cabc\u300d = NaN\r\n2\u9032\u6570\u300c789\u300d = NaN<\/pre>\n<p>\u3053\u306e\u4f8b\u3067\u306f\u3001\u300cabc\u300d\u3068\u3044\u304610\u9032\u6570\u306f\u5b58\u5728\u3057\u306a\u3044\u306e\u3067\u300cNaN\u300d\u3068\u3044\u3046\u7d50\u679c\u304c\u51fa\u529b\u3055\u308c\u3066\u3044\u308b\u306e\u304c\u5206\u304b\u308a\u307e\u3059\u306d\u3002\u540c\u3058\u3088\u3046\u306b\u30012\u9032\u6570\u306e\u5834\u5408\u306f\u300c0\u300d\u300c1\u300d\u4ee5\u5916\u306f\u6570\u5024\u3068\u5224\u65ad\u3055\u308c\u306a\u3044\u306e\u3067\u30012\u9032\u6570\u3092\u57fa\u6570\u3068\u3057\u305f\u5834\u5408\u306e\u300c789\u300d\u3082NaN\u306b\u5909\u63db\u3055\u308c\u307e\u3059\u3002<\/p>\n<p>\u3053\u306e\u3088\u3046\u306b\u5909\u63db\u51e6\u7406\u306e\u7d50\u679c\u3068\u3057\u3066\u300cNaN\u300d\u3092\u53d6\u5f97\u3057\u305f\u3068\u3044\u3046\u3053\u3068\u306f\u3001\u6b63\u5e38\u306b\u5909\u63db\u3067\u304d\u306a\u304b\u3063\u305f\u3053\u3068\u3092\u610f\u5473\u3059\u308b\u308f\u3051\u3067\u3059\u3002<\/p>\n<h3>try-catch\u3067\u8a8d\u8b58\u3055\u308c\u306a\u3044\u30a8\u30e9\u30fc\u3068\u306f\uff1f<\/h3>\n<p>\u6b63\u5e38\u306b\u5909\u63db\u3067\u304d\u306a\u304b\u3063\u305f\u5834\u5408\u306b\u300cNaN\u300d\u3068\u3044\u3046\u5024\u306b\u5909\u63db\u3055\u308c\u308b\u3053\u3068\u304c\u5206\u304b\u308a\u307e\u3057\u305f\u3002\u305d\u308c\u3067\u306f\u3001\u3053\u306e\u30a8\u30e9\u30fc\u3092\u51e6\u7406\u3059\u308b\u5834\u5408\u3092\u8003\u3048\u3066\u307f\u307e\u3057\u3087\u3046\uff01<\/p>\n<p>\u4e00\u756a\u6700\u521d\u306b\u8003\u3048\u308b\u306e\u306f\u300ctry-catch\u6587\u300d\u3092\u4f7f\u3063\u305f\u30a8\u30e9\u30fc\u30cf\u30f3\u30c9\u30ea\u30f3\u30b0\u3067\u306f\u306a\u3044\u3067\u3057\u3087\u3046\u304b\uff1f\u6b21\u306e\u30b5\u30f3\u30d7\u30eb\u4f8b\u3092\u898b\u3066\u304f\u3060\u3055\u3044\uff01<\/p>\n<pre class=\"lang:js decode:true\">try {\r\n\r\n    var result = parseInt('abcd');\r\n\r\n} catch(err) {\r\n\r\n    console.log(err);\r\n\r\n}\r\n<\/pre>\n<p>\u4e00\u822c\u7684\u306b\u306f\u3053\u306e\u3088\u3046\u306b\u8a18\u8ff0\u3059\u308b\u3053\u3068\u3067\u3001\u30d1\u30fc\u30b9\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u305f\u5834\u5408\u306bcatch()\u306e\u51e6\u7406\u304c\u5b9f\u884c\u3055\u308c\u308b\u3088\u3046\u306b\u898b\u3048\u307e\u3059\u306d\u3002\u3057\u304b\u3057\u306a\u304c\u3089\u3001catch()\u306e\u51e6\u7406\u306f\u5b9f\u884c\u3055\u308c\u306a\u3044\u306e\u3067\u3059\uff01<\/p>\n<p>JavaScript\u3067\u306f\u3001\u3042\u304f\u307e\u3067\u3082\u300cNaN\u300d\u3068\u3044\u3046\u5024\u304c\u4ee3\u5165\u3055\u308c\u305f\u3068\u3044\u3046\u3060\u3051\u3067\u3042\u3063\u3066\u30a8\u30e9\u30fc\u3068\u306f\u9055\u3046\u304b\u3089\u3067\u3059\u3002\u305d\u308c\u3067\u306f\u3001\u5024\u304c\u300cNaN\u300d\u3067\u3042\u308b\u304b\u3069\u3046\u304b\u3092\u3069\u306e\u3088\u3046\u306b\u5224\u65ad\u3059\u308c\u3070\u826f\u3044\u306e\u3067\u3057\u3087\u3046\u304b\uff1f<\/p>\n<p>\u4e00\u822c\u7684\u306b\u306f\u6a19\u6e96\u3067\u63d0\u4f9b\u3055\u308c\u3066\u3044\u308b\u300cisNaN()\u300d\u3068\u3044\u3046\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3046\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<h3>\u300cisNaN()\u300d\u3092\u4f7f\u3063\u305f\u30a8\u30e9\u30fc\u51e6\u7406\u306e\u65b9\u6cd5<\/h3>\n<p>\u524d\u7bc0\u306e\u3088\u3046\u306b\u3001parseInt\u306b\u6307\u5b9a\u3057\u305f\u6587\u5b57\u5217\u304c\u6570\u5024\u4ee5\u5916\u306e\u5834\u5408\u306f\u300cNaN\u300d\u306b\u5909\u63db\u3055\u308c\u3066\u3057\u307e\u3044\u307e\u3059\u3002\u3053\u306e\u3088\u3046\u306a\u5909\u63db\u30a8\u30e9\u30fc\u304c\u8d77\u304d\u305f\u969b\u3001JavaScript\u3067\u306f<b>\u300cisNaN()\u300d\u30e1\u30bd\u30c3\u30c9\u3092\u6d3b\u7528\u3059\u308b\u3053\u3068\u3067\u6761\u4ef6\u5206\u5c90\u3092\u4f5c\u308b\u3053\u3068\u304c\u53ef\u80fd<\/b>\u3067\u3059\u3002<\/p>\n<p>\u6b21\u306e\u30b5\u30f3\u30d7\u30eb\u4f8b\u3092\u898b\u3066\u304f\u3060\u3055\u3044\uff01<\/p>\n<pre class=\"lang:js decode:true \"> var result = parseInt(\"abc\", 10); \r\n\r\nif( isNaN(result) ) { \r\n\r\n    console.log( '\u6570\u5024\u3067\u306f\u3042\u308a\u307e\u305b\u3093\uff01' ); \r\n\r\n} else { \r\n\r\n    console.log( '\u6b63\u3057\u3044\u6570\u5024\u3067\u3059\uff01' ); \r\n\r\n}<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c<\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \">\u6570\u5024\u3067\u306f\u3042\u308a\u307e\u305b\u3093\uff01<\/pre>\n<p>\u3053\u306e\u4f8b\u3067\u306f\u3001\u6587\u5b57\u5217\u300cabc\u300d\u309210\u9032\u6570\u306e\u6570\u5024\u306b\u5909\u63db\u3057\u3088\u3046\u3068\u3057\u3066\u3044\u307e\u3059\u3002\u3057\u304b\u3057\u306a\u304c\u3089\u3001\u6570\u5024\u3068\u3057\u3066\u8a8d\u8b58\u3055\u308c\u306a\u3044\u306e\u3067\u7d50\u679c\u7684\u306b\u300cNaN\u300d\u304c\u51fa\u529b\u3055\u308c\u307e\u3059\u3002<\/p>\n<p>\u3053\u306e\u6642\u306b\u3001\u300cisNaN()\u300d\u306e\u5f15\u6570\u3078parseInt()\u3057\u305f\u7d50\u679c\u3092\u6307\u5b9a\u3059\u308b\u3053\u3068\u3067\u8a8d\u8b58\u30a8\u30e9\u30fc\u304b\u3069\u3046\u304b\u3092\u78ba\u8a8d\u3067\u304d\u308b\u308f\u3051\u3067\u3059\u3002\u6570\u5024\u5909\u63db\u3059\u308b\u969b\u306b\u306f\u3001\u3053\u306e\u3088\u3046\u306a\u6761\u4ef6\u5206\u5c90\u3092\u4f5c\u6210\u3059\u308b\u3053\u3068\u3067\u610f\u56f3\u3057\u306a\u3044\u5024\u304c\u5165\u3063\u3066\u304d\u305f\u5834\u5408\u306e\u4e0d\u5177\u5408\u3092\u4e8b\u524d\u306b\u77e5\u308b\u624b\u304c\u304b\u308a\u3068\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<h2>parseFloat()\u3067\u5c0f\u6570\u70b9\u306b\u5909\u63db\u3059\u308b\u65b9\u6cd5<\/h2>\n<p>\u3055\u3066\u3001\u3053\u308c\u307e\u3067\u306f\u6574\u6570\u306e\u6570\u5024\u5909\u63db\u3092\u898b\u3066\u304d\u307e\u3057\u305f\u304c\u3001<b>\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u6271\u3046\u6570\u5024\u306b\u306f\u300c\u5c0f\u6570\u70b9\u300d\u3082\u5b58\u5728<\/b>\u3057\u307e\u3059\u3002\u305d\u3053\u3067\u3001\u540c\u3058\u3088\u3046\u306b\u5c0f\u6570\u70b9\u306e\u6587\u5b57\u5217\u3092\u6570\u5024\u5909\u63db\u3059\u308b\u305f\u3081\u306e\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u51e6\u7406\u306b\u3064\u3044\u3066\u3082\u5b66\u7fd2\u3092\u9032\u3081\u3066\u3044\u304d\u307e\u3057\u3087\u3046\uff01<\/p>\n<p>JavaScript\u3067\u306f\u3001\u5c0f\u6570\u70b9\u306e\u6570\u5024\u5909\u63db\u3092\u884c\u3046\u305f\u3081\u306b\u300cparseFloat\u300d\u3068\u3044\u3046\u30e1\u30bd\u30c3\u30c9\u304c\u7528\u610f\u3055\u308c\u3066\u3044\u308b\u306e\u3067\u8a73\u3057\u304f\u898b\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n<h3>parseFloat()\u3067\u6587\u5b57\u5217\u3092\u5c0f\u6570\u70b9\u306b\u5909\u63db\u3059\u308b\u65b9\u6cd5<\/h3>\n<p>parseFloat\u306b\u95a2\u3057\u3066\u306f\u3001\u57fa\u672c\u7684\u306a\u6271\u3044\u304c\u300cparseInt\u300d\u3068\u307b\u3068\u3093\u3069\u5909\u308f\u308a\u307e\u305b\u3093\u3002\u3057\u304b\u3057\u306a\u304c\u3089\u3001\u6ce8\u610f\u3059\u3079\u304d\u70b9\u3068\u3057\u3066\u300c\u57fa\u6570\u300d\u304c\u7528\u610f\u3055\u308c\u3066\u3044\u306a\u3044\u305f\u3081\u306b\u4e00\u822c\u7684\u306a10\u9032\u6570\u306b\u3088\u308b\u5c0f\u6570\u70b9\u3092\u6271\u3046\u3068\u3044\u3046\u70b9\u3092\u899a\u3048\u3066\u304a\u304d\u307e\u3057\u3087\u3046\uff01<\/p>\n<p>\u5b9f\u969b\u306e\u30b3\u30fc\u30c9\u4f8b\u3068\u3057\u3066\u3001\u6b21\u306e\u30b5\u30f3\u30d7\u30eb\u3092\u898b\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<pre class=\"lang:js decode:true \">var result1 = parseFloat('3.14');\r\nvar result2 = parseFloat('314e-2');\r\n\r\nconsole.log( 'parseFloat(\"3.14\") = ' + result1 );\r\nconsole.log( 'parseFloat(\"314e-2\") = ' + result2 );<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c<\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \">parseFloat(\"3.14\") = 3.14\r\nparseFloat(\"314e-2\") = 3.14<\/pre>\n<p>\u3053\u306e\u4f8b\u3067\u306f\u3001\u5c0f\u6570\u70b9\u300c3.14\u300d\u306e\u6587\u5b57\u5217\u3092parseFloat\u306e\u5f15\u6570\u306b\u5f53\u3066\u306f\u3081\u3066\u304a\u308a\u3001\u305d\u306e\u307e\u307e\u6570\u5024\u306e\u300c3.14\u300d\u306b\u5909\u63db\u3055\u308c\u3066\u3044\u308b\u306e\u304c\u5206\u304b\u308a\u307e\u3059\u306d\u3002<\/p>\n<p>\u307e\u305f\u300110\u306en\u4e57\u306f<b>\u300ce &#8211; n\u4e57\u300d\u3082\u3057\u304f\u306f\u300ce + n\u4e57\u300d\u3068\u8a18\u8ff0\u3067\u304d\u308b<\/b>\u306e\u3067\u3001\u4f8b\u3048\u307010\u306e\u30de\u30a4\u30ca\u30b916\u4e57\u3092\u8868\u73fe\u3057\u305f\u3051\u308c\u3070\u3001\u300ce-16\u300d\u3068\u306a\u308a\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u30012\u3064\u76ee\u306e\u300c314e-2\u300d\u306f10\u306e\u30de\u30a4\u30ca\u30b92\u4e57\u3068\u306a\u308a\u3001\u6700\u7d42\u7684\u306b1\u3064\u76ee\u3068\u540c\u3058\u5c0f\u6570\u70b9\u65703.14\u306b\u5909\u63db\u3055\u308c\u308b\u3068\u3044\u3046\u308f\u3051\u3067\u3059\u3002<\/p>\n<h3>parseFloat()\u3067\u9593\u9055\u3044\u3084\u3059\u3044\u5909\u63db\u4f8b(example)<\/h3>\n<p>parseFloat()\u306e\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9\u3092\u5b66\u3093\u3060\u3068\u3053\u308d\u3067\u3001\u5b9f\u969b\u306e\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u3067\u9593\u9055\u3044\u3084\u3059\u3044\u4f8b\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002parseInt()\u3068\u5171\u901a\u3059\u308b\u90e8\u5206\u3082\u3042\u308a\u307e\u3059\u304c\u3001\u5408\u308f\u305b\u3066\u78ba\u8a8d\u3057\u3066\u304a\u304f\u3068\u826f\u3044\u3067\u3057\u3087\u3046\u3002<\/p>\n<p>\u6b21\u306e\u30b5\u30f3\u30d7\u30eb\u4f8b\u3092\u898b\u3066\u304f\u3060\u3055\u3044\uff01<\/p>\n<pre class=\"lang:js decode:true \">console.log('16.0 = ' + parseFloat(\"16.0\"));\r\nconsole.log('1.23px = ' + parseFloat(\"1.23px\"));\r\nconsole.log('a1.23 = ' + parseFloat(\"a1.23\"));<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c<\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \">16.0 = 16\r\n1.23px = 1.23\r\na1.23 = NaN<\/pre>\n<p>\u307e\u305a\u6700\u521d\u306b\u3001\u5c0f\u6570\u70b9\u300c16.0\u300d\u3092\u5909\u63db\u3057\u305f\u4f8b\u306b\u6ce8\u76ee\u3057\u3066\u304f\u3060\u3055\u3044\uff01\u5c0f\u6570\u70b9\u4ee5\u4e0b\u304c\u300c.0\u300d\u306e\u5834\u5408\u306b\u95a2\u3057\u3066\u306f\u7701\u7565\u3055\u308c\u308b\u4ed5\u69d8\u306a\u306e\u3067\u3001\u6570\u5024\u306e\u300c16\u300d\u3060\u3051\u304c\u53d6\u5f97\u3067\u304d\u308b\u3068\u3044\u3046\u70b9\u306b\u6ce8\u610f\u304c\u5fc5\u8981\u3067\u3059\u3002<\/p>\n<p>\u305d\u306e\u305f\u3081\u3001\u4f8b\u3048\u3070\u300c16.012\u300d\u3067\u3042\u308c\u3070\u305d\u306e\u307e\u307e\u300c16.012\u300d\u3067\u53d6\u5f97\u3067\u304d\u308b\u308f\u3051\u3067\u3059\u3002\u307e\u305f\u3001\u300c1.23px\u300d\u306e\u5834\u5408\u306f\u300cpx\u300d\u304c\u6570\u5024\u3068\u3057\u3066\u8a8d\u8b58\u3055\u308c\u306a\u3044\u306e\u3067\u305d\u306e\u6642\u70b9\u3067\u5909\u63db\u51e6\u7406\u304c\u4e2d\u65ad\u3057\u3066\u3044\u308b\u306e\u304c\u5206\u304b\u308a\u307e\u3059\u3002<\/p>\n<p>\u3057\u304b\u3057\u3001\u6587\u5b57\u5217\u306e\u5148\u982d\u306b\u300ca\u300d\u306a\u3069\u306e<b>\u6570\u5024\u4ee5\u5916\u304c\u5b58\u5728\u3059\u308b\u3068\u305d\u3082\u305d\u3082\u5909\u63db\u51e6\u7406\u304c\u884c\u308f\u308c\u306a\u3044<\/b>\u306e\u3067\u300cNaN\u300d\u306b\u306a\u308b\u3068\u3044\u3046\u70b9\u306b\u6ce8\u610f\u3057\u307e\u3057\u3087\u3046\uff01<\/p>\n<h3>parseFloat\u306e\u30a8\u30e9\u30fc\u30cf\u30f3\u30c9\u30ea\u30f3\u30b0\u306b\u3064\u3044\u3066<\/h3>\n<p>parseFloat\u3082\u3001\u6587\u5b57\u5217\u3092\u5c0f\u6570\u70b9\u306b\u5909\u63db\u3067\u304d\u306a\u304b\u3063\u305f\u5834\u5408\u306b\u306f\u30a8\u30e9\u30fc\u3068\u3057\u3066\u300cNaN\u300d\u3092\u8fd4\u3057\u307e\u3059\u3002\u305d\u3053\u3067\u3001parseInt\u306e\u6642\u3068\u540c\u3058\u3088\u3046\u306b\u300cisNaN()\u300d\u30e1\u30bd\u30c3\u30c9\u3067\u6761\u4ef6\u5206\u5c90\u3059\u308b\u95a2\u6570\u3092\u4f5c\u3063\u3066\u307f\u307e\u3057\u3087\u3046\uff01<\/p>\n<pre class=\"lang:js decode:true \">function strToFloat(value) {\r\n    var num = parseFloat(value);\r\n\r\n    if (isNaN(num)) {\r\n        num = 0;\r\n    }\r\n\r\n    return num;\r\n}\r\n\r\nconsole.log(\"strToFloat(123.456) = \" + strToFloat('123.456'));\r\nconsole.log(\"strToFloat(abc12.34) = \" + strToFloat('abc12.34'));<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c<\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \">strToFloat(123.456) = 123.456\r\nstrToFloat(abc12.34) = 0<\/pre>\n<p>\u3053\u306e\u4f8b\u3067\u306f\u3001\u300cstrToFloat\u300d\u95a2\u6570\u3092\u4f5c\u6210\u3057\u3066\u5f15\u6570\u306b\u5bfe\u8c61\u3068\u306a\u308b\u5c0f\u6570\u70b9\u3092\u5f53\u3066\u306f\u3081\u308b\u3053\u3068\u3067\u3001\u6761\u4ef6\u5206\u5c90\u3092\u884c\u3046\u3088\u3046\u306b\u3057\u3066\u3044\u307e\u3059\u3002\u300cabc12.34\u300d\u306e\u3088\u3046\u306b\u3001\u5c0f\u6570\u70b9\u3092\u8a8d\u8b58\u3055\u308c\u306a\u3044\u5024\u304c\u4ee3\u5165\u3055\u308c\u305f\u5834\u5408\u306b\u306f\u300cNaN\u300d\u3068\u306a\u308a\u3001\u8fd4\u308a\u5024\u306b0\u3092\u4ee3\u5165\u3057\u3066\u3044\u308b\u306e\u304c\u5b9f\u884c\u7d50\u679c\u304b\u3089\u3082\u5206\u304b\u308a\u307e\u3059\u306d\u3002<\/p>\n<p>\u3082\u3061\u308d\u3093\u3001parseInt\u306e\u6642\u3068\u540c\u3058\u3088\u3046\u306b<b>\u300cOR ( || )\u300d\u306e\u8ad6\u7406\u6f14\u7b97\u5b50\u3092\u4f7f\u3063\u305f\u624b\u6cd5<\/b>\u3082\u554f\u984c\u306a\u304f\u6d3b\u7528\u3067\u304d\u308b\u306e\u3067\u3001\u305c\u3072\u78ba\u304b\u3081\u308b\u3088\u3046\u306b\u3057\u3066\u304a\u3044\u3066\u304f\u3060\u3055\u3044\uff01<\/p>\n<h2>\u307e\u3068\u3081<\/h2>\n<p>\u4eca\u56de\u306f\u3001JavaScript\u3067\u6574\u6570\u3084\u5c0f\u6570\u70b9\u306e\u6587\u5b57\u5217\u3092\u6570\u5024\u5909\u63db\u3067\u304d\u308b\u300cparseInt\u300d\u300cparseFloat\u300d\u306b\u3064\u3044\u3066\u5b66\u7fd2\u3092\u3057\u307e\u3057\u305f\uff01<\/p>\n<p>\u6700\u5f8c\u306b\u3001\u91cd\u8981\u306a\u30dd\u30a4\u30f3\u30c8\u3092\u304a\u3055\u3089\u3044\u3057\u3066\u304a\u304d\u307e\u3057\u3087\u3046\uff01<br \/>\n<div class=\"box01\"><\/p>\n<ul>\n<li><b>\u300cparseInt()\u300d\u3092\u4f7f\u3046\u3068\u6587\u5b57\u5217\u306e\u6570\u5b57\u3092Number\u578b\u306e\u6570\u5024\u306b\u5909\u63db\u3067\u304d\u308b<\/b><\/li>\n<li><b>\u6570\u5024\u306b\u5909\u63db\u3067\u304d\u306a\u3044\u5834\u5408\u306b\u306f\u300cNaN\u300d\u304c\u8fd4\u3055\u308c\u308b\u306e\u3067IF\u6587\u3067\u6761\u4ef6\u5206\u5c90\u304c\u3067\u304d\u308b<\/b><\/li>\n<li><b>\u30ab\u30f3\u30de\u533a\u5207\u308a\u306e\u6587\u5b57\u5217\u306b\u3064\u3044\u3066\u306f\u3001replace()\u3092\u6d3b\u7528\u3059\u308b\u3053\u3068\u3067\u6570\u5024\u5909\u63db\u304c\u53ef\u80fd<\/b><\/li>\n<li><b>\u300cparseFloat()\u300d\u3092\u4f7f\u3046\u3068\u5c0f\u6570\u70b9\u306e\u6587\u5b57\u5217\u3092\u6570\u5024\u5909\u63db\u3067\u304d\u308b<\/b><\/li>\n<\/ul>\n<\/div>\n<p>\u3053\u308c\u3089\u306e\u5185\u5bb9\u3092\u8e0f\u307e\u3048\u3066\u3001\u305c\u3072\u81ea\u5206\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u306b\u3082\u7a4d\u6975\u7684\u306b\u53d6\u308a\u5165\u308c\u3066\u5b66\u7fd2\u3092\u9032\u3081\u308b\u3088\u3046\u306b\u3057\u3066\u3044\u304d\u307e\u3057\u3087\u3046\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>JavaScript\u3092\u4f7f\u3063\u3066\u3044\u308b\u3068\u3001\u6587\u5b57\u5217\u3092\u6574\u6570\u3084\u5c0f\u6570\u70b9\u306b\u5909\u63db\u3059\u308b\u5fc5\u8981\u6027\u304c\u3067\u3066\u304f\u308b\u3053\u3068\u3082\u3042\u308a\u307e\u3059\u3002 \u4eca\u56de\u306f\u3001JavaScript\u3067\u6570\u5024\u5909\u63db\u3092\u3057\u305f\u3044\u5834\u5408\u306b\u3088\u304f\u4f7f\u3046\u300cparseInt\u300d\u3084\u3001\u5c0f\u6570\u70b9\u3092\u6271\u3046\u969b\u306b\u4fbf\u5229\u306a\u300cparseF [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":75785,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"swell_btn_cv_data":"","footnotes":""},"categories":[2346],"tags":[95,1588,1587],"class_list":["post-24269","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-javascript-study","tag-javascript","tag-parsefloat","tag-parseint"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ 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